20581080998 has 4 divisors (see below), whose sum is σ = 30871621500. Its totient is φ = 10290540498.

The previous prime is 20581080983. The next prime is 20581081019. The reversal of 20581080998 is 89908018502.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5145270248 + ... + 5145270251.

It is an arithmetic number, because the mean of its divisors is an integer number (7717905375).

Almost surely, 2^20581080998 is an apocalyptic number.

20581080998 is a deficient number, since it is larger than the sum of its proper divisors (10290540502).

20581080998 is a wasteful number, since it uses less digits than its factorization.

20581080998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10290540501.

The product of its (nonzero) digits is 414720, while the sum is 50.

The spelling of 20581080998 in words is "twenty billion, five hundred eighty-one million, eighty thousand, nine hundred ninety-eight".